Myocardial scintigraphy with 99mTc-tris-DMPE in man

Area of Science:

• Nuclear Medicine
• Cardiology
• Radiopharmacology

Background:

• Myocardial infarction and mitral regurgitation are significant cardiac conditions.
• Accurate myocardial perfusion imaging is crucial for diagnosis and management.
• Novel radiotracers are continuously explored to improve imaging techniques.

Purpose of the Study:

• To evaluate the utility of 99mTc-tris-DMPE for cardiac scintigraphy.
• To assess the feasibility of gated blood pool scintigraphy and myocardial perfusion imaging with 99mTc-tris-DMPE.
• To compare the image quality of 99mTc-tris-DMPE with other imaging agents.

Main Methods:

• Cardiac scintigraphy was performed in 11 patients (6 with myocardial infarction, 1 with mitral regurgitation) and 4 healthy volunteers.
• 99mTc-tris-DMPE was administered, followed by early blood pool imaging and delayed myocardial phase imaging (12-14 hours post-administration).
• Resting myocardial perfusion image quality was assessed and compared to 99mTc-dichloro-DMPE and 201Tl.

Main Results:

• An intense early blood pool phase allowed for gated blood pool scintigraphy and left ventricular ejection fraction calculation.
• Myocardial perfusion imaging was successfully performed 12-14 hours after 99mTc-tris-DMPE administration.
• Resting myocardial perfusion image quality with 99mTc-tris-DMPE was superior to 99mTc-dichloro-DMPE but inferior to 201Tl.

Conclusions:

• 99mTc-tris-DMPE can be used for gated blood pool scintigraphy and delayed myocardial perfusion imaging.
• While offering advantages over 99mTc-dichloro-DMPE, 99mTc-tris-DMPE's perfusion imaging quality is not yet comparable to 201Tl.
• Further research may optimize the use of 99mTc-tris-DMPE in cardiac diagnostics.